Yealink T21PE2 User Manual

Account Settings
213
Values
1-TCP
2-TLS
3-DNS-NAPTR, if no server port is given, the IP phone performs the DNS NAPTR and SRV queries for the
service type and port.
Default 0
Web UI Account->Register->SIP Server Y->Transport
Parameter
account.X.naptr_build
[1]
<MAC>.cfg
Description
It configures the way of SRV query for the IP phone to be performed when no result is returned from
NAPTR query.
Permitted
Values
0-SRV query using UDP only
1-SRV query using UDP, TCP and TLS.
Default 0
Parameter sip.dns_transport_type <y0000000000xx>.cfg
Description It configures the transport protocol the IP phone uses to perform a DNS query.
Permitted
Values
0-UDP
1-TCP
Default 0
Parameter
static.network.dns.query_timeout
[3]
<y0000000000xx>.cfg
Description
It configures the interval (in seconds) at which the phone retries to resolve a domain name when the DNS
server does not respond.
Permitted
Values
0 to 65535
Default 3
Parameter
static.network.dns.retry_times
[3]
<y0000000000xx>.cfg
Description It configures the retry times when the DNS server does not respond.
Permitted
Values
0 to 65535
Default 2
[1]
X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for T41P/T41S/T27G,
X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2/CP920, X=1.
[2]
Y is the server ID. Y=1-2.
[3]
If you change this parameter, the IP phone will reboot to make the change take effect.
Static DNS Cache
Failover redundancy can only be utilized when the configured domain name of the server is resolved to multiple IP
addresses. If the IP phone is not configured with a DNS server, or the DNS query returns no result from a DNS server,
you can statically configure a set of DNS NAPTR/SRV/A records into the IP phone. The IP phone will attempt to resolve
the domain name of the SIP server with static DNS cache.

Yealink T21PE2 Specifications

General

Brand	Yealink
Model	T21PE2
Category	IP Phone
Language	English